Automatic combination tool-holder.



0,1. HEINKEL & W. G. LUETERS. AUTOMATIC COMBINATION TOOL HOLDER.APPLICATION FILED SEPT. 13, 1909.

1,069,614. Patented Aug. 5, 1913;

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CHRISTIAN F. I-IEINKEL AND WILLIAM G. LUETERS, OF CLEVELAND, OHIO.

AUTOMATIC COMBINATION TOOL-HOLDER.

Specification of Letters Patent.

Patented Aug. 5,1913.

Application filed September 13, 1969. Serial No. 517,512.

To all whom it may concern Be it known that we, CHRISTIAN F. HEIN- 1am.and WILLIAM G. Lunrnns, citizens of the United States, residing atCleveland, in the county of Cuyahoga and State of Ohio, have invented anew and useful Improvement in Automatic Combination Tool-Holders, ofwhich the following is a specification.

Our invention relates to improvements in automatic combination toolholders in which tools with a variety of shanks may be held as well aschanged without stopping the machine in which said tools are used.

The object of our invention is a tool holder in which a tool with anyshape of shank can be held automatically, and in which the changes oftools with either similarly or differently shaped shanks can be effectedwhile the machine, in which said tools are used is in motion. WVe attainthis object by the mechanism illustrated in the accornpanying drawing,in which- Figure I is a sectional view of a chuck with taper-shankholder shown in position in dotted lines. Fig. II is a section throughcenter-line of a taper-shank tool-holder. Fig. III is a partialside-view of a chuck showing relation and contour of slots andprojections.

Similar numerals refer to similar parts throughout the several views.

Our automatic combination tool holder consists, principally, of a chuckand one or more tool holders.

In carrying out our invention, we prefer to construct the chuck of abody 1, of sleeve 2, of spring 3, and of threaded collar 1.

Body 1 may have a taper'shank as shown, or may have a straight shank, ormay be the terminal or end of the spindle of a machine, as for instancea drill-press. Central opening 5, adapted to receive holder as willappear hereinafter, extends into body 1 some distance, and terminates ina conical end 6 and a clearance-opening 7 which is for the purpose offacilitating machining of conical end 6. Two longitudinal anddiametrically opposite slots 8, extending part way up, are cut throughthe tubular portion of body 1 for the purpose of receiving and clearingthe projections on the holders, as will appear hereinafter.

Sleeve 2 fits rotatably over tubular portion of body 1 and has anannular recess 9, coinciding with an annular and similar recess 9 inbody 1, to receive spring 3. Step 10 is for the purpose of preventingsleeve 2 from moving down. Two slots 11, diametrically opposite, and,preferably, of the contour shown in Fig. III, are cut through the end ofsleeve 2, to receive the projections of the holder, as will appearhereinafter. Two diametrically opposite projections 12 are provided onsleeve 2 for the purpose of catching the projections on the holders, aswill appear hereinafter. The upper and en larged portion of sleeve 2 is,preferably, knurled, the purpose of which will appear hereinafter.

Spring 3, preferably a fiat coil spring as shown, but may be made ofround or square wire, is placed in recess 9, and has its one end securedto pin 13 placed in body 1, while its other end is secured to pin 14placed in sleeve 2.

Collar 1 has a central and threaded opening adapted to a threadedportion provided for that purpose on body 1, and is for the purpose ofaccess to the spring 3, as well as preventing sleeve 2 from moving up.It will be seen that the step 10 and collar 4: prevent sleeve 2 frommoving either way, longitudinally, while sufficient play can be allowed,by means of the thread, to allow sleeve 2 to move rotatably. Aprojection similar to projection 12 on sleeve 2, may be provided on oneside of each slot 8 of body 1, to act as a stop for projection 17 saidprojections on body 1 need not be as large as projections 12, and may beomitted and the usual stop-pin and slot may be provided in sleeve 2 andbody 1 respectively.

A holder, adapted for taper-shank tools, is shown dotted in position inFig. I, and in section in Fig. II, and consists of a body 15 and aprotection-sleeve 16.

The raised portions 15 of body 15 fit rotatably and slidingly intocentral opening 5 of the chuck (previously mentioned), and the recessedportions 15", although not necessary, may be provided, so that body 15may bear at top and bottom only, thus permitting of a better fit. Theupper portion of body 15 terminates in a conical face 15, to lit to, andbear against conical end (S of central opening 5 when the holder isinserted in the chuck. Two diametrically opposite projections 17,preferably of square or rectangular cross-section, are provided on body15 to engage in slots 8 of the chuck, and two projections 18, preferablyof circular crosssection, are provided on projections'l'? to engageslots 11 of the chuck. Flange 19 is for the purpose of receivingprotectionsleeve 16. Central opening 20 is adapted to receive the usualor special taper-shank tools, and opening 21 is for the purpose ofinserting the usual pin or key in order to remove said taper-shank toolsfrom the holder. Protection-sleeve 16 is driven, or shrunk, or otherwisesecured to flange 19, and extends upward far enough to cover projections17, and 18, as well as slots 11. It may be not-ed here that in similarchucks now in use, the projections and slots are not protected and aredangerous to the operator.

The operation of the chuck is as follows: After the chuck is in positionin the machine, the machine is started, and in order to insert a tool,for instance a taper-shank drill, place the drill in its proper holder,then insert and push said holder up into the central opening 5 which isprovided for that purpose in body 1 of the chuck, as previously stated,until the projections 18 on the holder strike, or will be caught byprojections 12 on sleeve 2, the holder will then begin to rotate, but ifheld back, or if friction is applied by means of the operators handholding protection-sleeve 16, which is knurled for that purpose,projection 18 will turn sleeve 2 backward, thus allowing projection 17to find slot 8 and move up therein until conical face 15 abuts onconical end 6. The operators hand is then removed from protection-sleeve16, spring 3 will turn sleeve 2 forward and, by means of the lesserincline of slot 11, will press or wedge the holder upward and againstsaid conical face, thus centering the holder as well as keeping it up inposition. The drivin of the holder with its drill is accomplishedthrough projections 17 in slots 8, while the holder is held in positionby means of projections 18 and slots 11. The contour of slots 11 is,preferably, of a compound incline, the lower portion being steeper thanthe upper portion, so that an upward movement is given to the holder,and a backward turning movement is given to sleeve 2 when caught onprojections 12. The upper portion of slots 11 has less incline, so thata wedging act-ion upward is produced on the holder.

In order to remove any holder from the chuck, apply friction, by meansof the hand or otherwise, to the enlarged portion of sleeve 2 which isknurled for that purpose, sleeve 2 will then turn backward and, theupward pressure, which was caused by the lesser incline, being removed,the holder will fall out, or may be removed easily.

The operation of the taper-shank holders needs no particularexplanation; the tapershank tools are inserted in their respectiveholder and driven out by means of a key inserted in slot 21.

It should be noted that in the operations mentioned the machine or themachine and the chuck is supposed to be rotating, if not, or if a toolis to be inserted or removed while the holder is not in the chuck, theprotec tion-sleeves must be turned backward in order to insert or removea tool; otherwise the operations are similar to those previouslymentioned or described.

It'may further be noted that the conical end in central opening 5 ofFig. I, and the conical faces on the body of the several holders are notabsolutely necessary and may be omitted, since the raised portions onthe several bodies fit into said central opening and are centeredthereby.

It may further be noted that, instead of slot 21 in body 15 of Fig. 11,an opening may be provided in the end of said body and the taper-shanktools driven out therethrough.

It may further be noted that a recess may be cut into collar 4, and pin14 made long enough to enter said recess so that a stop may be providedbetween body 1 and sleeve 2.

It will be seen that, with this invention, a change of tools can beeffected without stopping the machine, thereby saving considerable time,and further, all dangerous projections, upon which the operator may becaught and injured are protected by our protection sleeve.

lVe claim:

1. In a combination tool holder the combination of a tool holder chuckwith one or more tool holders; the said tool holder chuck having a bodywith a suitable shank at one end and a tubular portion at the other end,straight and longitudinal slots in the end of said tubular portion, asleeve over the larger portion of said body, slots in said sleeve, and aspring operatively connected between said body and said sleeve; each ofthe said tool holders having a body adapted to enter into and center insaid tubular portion of said chuck, projections on said body adapted toenter into said slots of said chuck and said sleeve, a-fiange on saidbody, a central opening in said body adapted to receive a tool shank,and a protection sleeve secured at one end to said flange and extendingat the other end over said projections so as to cover said projectionson the tool holder and said slots in the chuck when the tool holder isinserted in operative position in the chuck.

2. A tool holder chuck having a body with a suitable shank at one endand a larger tubular portion at the other end, the opening in saidtubular portion being adapted to receive a tool holder and having aconical end adapted to center a tool holder, straight and longitudinalslots in the end of said tubular portion, a sleeve mounted rotatablyupon said larger portion and having inclined slots in the end thereof,the

sides of the lower or open portion of said inclined slots being inclinedmore toward the longitudinal than toward the transverse axis of saidchuck to permit the driving projections on said tool holder to entersaid slots readily, the sides of the upper portion of said inclinedslots being inclined more toward the transverse than toward thelongitudinal axis of said chuck for the purpose of exerting a wedgingaction upward against said driving projections and thereby holding saidtool holder in position in said chuck, projections on said sleeveext-ending below the main body thereof and adjacent to said inclinedslots and so disposed that the front face of said projections forms acontinuation of the rear side of said inclined slots,

and a spring having one end secured to said sleeve and the other end tosaid chuck for the purpose of forcing said sleeve rotatably forward tohold said tool holder in position in said chuck when said sleeve is innormal position, said spring being disposed to permit said sleeve to berotated backward against the tension of said spring when inserting saidholder into said chuck.

8. A tool holder having a body, driving projections on said body, acentral opening in said body adapted to receive a tool shank, a conicalend on said body to center said holder in a chuck, a flange on saidbody, a protection sleeve secured at one end to said flange andextending at the other end over said driving projections so as to coversaid driving pro ections.

CHRISTIAN F. HEINKEL. WILLIAM G. LUETERS. Witnesses:

FRANK S. SMITH, HENRY R. SYDON.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, I). 0.

